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What's the difference between ConcurrentHashMap and Collections.synchronizedMap(Map)?
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123
Please also note that the ConcurrentHashMap does not allow null keys or values. So they are NOT equal alternatives of a synchronized map.
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Is it ok to use dashes in Python files when trying to import them?
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123
One other thing to note in your code is that import is not a function. So import(python-code)...
Xcode 6 - How to pick signing certificate/provisioning profile for Ad-Hoc distribution?
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AlexHsiehAlexHsieh
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ByteBuffer.allocate() vs. ByteBuffer.allocateDirect()
...ually the
best choice for I/O operations. By
design, they support the most
efficient I/O mechanism available to
the JVM. Nondirect byte buffers can be
passed to channels, but doing so may
incur a performance penalty. It's
usually not possible for a nondirect
buffer to be the target o...
Remove rows with all or some NAs (missing values) in data.frame
...mptions --------------------
fakeData <- function(m, n, p){
set.seed(123)
m <- matrix(runif(m*n), nrow=m, ncol=n)
m[m<p] <- NA
return(m)
}
df <- cbind( data.frame(id = paste0('ID',seq(row_size)),
stringsAsFactors = FALSE),
data.frame(fak...
HTTP status code for update and delete?
...atus code is the request sent by the client is valid (DELETE mySite/entity/123) and the entity to delete does not exist.
– Martin
Dec 30 '11 at 21:27
69
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How do I print a double value without scientific notation using Java?
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123
You could use printf() with %f:
double dexp = 12345678;
System.out.printf("dexp: %f\n", dexp)...
What's the best visual merge tool for Git? [closed]
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Meld is a free, open-source, and cross-platform (UNIX/Linux, OSX, Windows) diff/merge tool.
Here's how to install it on:
Ubuntu
Mac
Windows: "The recommended version of Meld for Windows is the most recent release, available as an MSI from https://meldmerge....
How do I focus on one spec in jasmine.js?
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}
})
Now you can run just the whole spec by this url http://localhost:8888?spec=MySpec and a the first test with http://localhost:8888?spec=MySpec+function+1
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Error while installing json gem 'mkmf.rb can't find header files for ruby'
...ruby -e 'puts RUBY_VERSION[/\d+\.\d+/]'`-dev
The first link you’ve posted is exactly your case: there is no ruby development environment installed. Development env is needed to compile ruby extensions, which are mostly written in C. Proxy has nothing to do with the problem: everything is down...